Thinking flow of theory of constraints (TOC) about product contradiction problem is briefly analyzed and innovative design process of theory of inventive problem solving (TRIZ) is presented. And then the five diagrams in TOC and their mutual relations are described. Furthermore, a design methodology of process construction model to solve product contradiction, which combines TRIZ and TOC together, is put forward. By means of future reality tree, legitimate diagramsand contradiction-solving matrix based on TRIZ, product contradiction problemsare settled. Illustrations have demonstrated that it is feasible to drive product innovative design by integrating TRIZ and TOC.

The probabilistic perturbation method and Edgeworth series technique are employed to present a practical and effective optimization design method forkinematics accuracy reliability of the planar linkage machine with arbitrary distribution parameters under the conditions of given the first four moments of basic random variables. Corresponding program can be utilized to obtain reliability optimization design information of planar linkage machine with arbitrary distribution parameters accurately and quickly. And the results demonstrate that the method proposed in this paper is effective and practical.

In concept design phase, selection and evaluation of mechanism are crucial. Two\|level fuzzy synthesis judgments method based on hierarchical analysis method is   proposed, which adopts fuzzy statistical cut\|and\|try method to determine degree of membership and utilizes 1-9 scale law in analytic hierarchy process (AHP) to decide weights. This method combines qualitative analysis with quantitative one, and integrates personal experience and judgments with mathematical operation, which circumscribes person's subjective factor into minimum range to guarantee the correctness of evaluation result. 

Aiming at the development of virtual reality system, a new scenario is presented. This scenario realizes interactive operation of virtual reality system by extra-programs of Director MX and Lingo. It supports usual interactive operation and simultaneously avoids OpenGL and C Programming, which greatly decreases developing complexity. Furthermore, research on collision inspection principle combining with the extra-program- Havok, is carried out. Finally, BSP portioning is evolved according to accuracy requirement of practical virtual reality system.

Structure of cutter and bearing were designed according to the requirements of 3D measuring system. To make the compare of the performance of the twoschemes through experiment convenient, design requirements of the test prototype machine were proposed. Specific virtual design flow was worked out and parametric solid model based on Pro/E was built. Then finite element static analysis and gravity center coordinates calculation were carried out. Finally, specific structure of test prototype was designed and the analysis result indicated that this scheme met the requirements of test prototype machine. Application of virtual design can improve quality and efficiency of design greatly and simplify analysis calculation process, whose design flow can provide references for design of other test prototype machine.

Variety of molding unit features of injection molding part bring complexity both to injection molding core-pulling mechanism design and spatial layout in injection molding design. Based on motion principle of this mechanism, its function model is established and the reconfigurable function unit as well as structure unit model is put forward. Based on repository of side direction moldingmethod, function unit and structure unit of core-pulling mechanism, the reconfigurable design algorithm of this mechanism is set up. This algorithm is based onits function unit and structure unit model, and implements the reuse of its design resource. Besides, this algorithm effectively solves the knowledge management of this mechanism from the aspect of methodology. Based on repository of side direction molding method, map algorithm between side direction molding unit features and core-pulling unit, the integrated core-pulling of side direction cores is implemented, which avoids redundancy. On the basis of spatial layout restricted map method between function unit and structure unit, its fast design is realized. This method has been validated by an engineering example.

Based on motion output theory of parallel mechanism, and considering symmetry and decoupling property of its structure, a novel 3-DOF (two translations and one rotation) parallel robot mechanism was put forward. And then kinematics problems of position inverse modeling were presented and numerical solution was obtained by Matlab. Furthermore, the reachable workspace of this mechanism isdescribed by drawing method and factors influencing it were found. Its application on a milling machine is offered. This mechanism has good symmetry and decoupling property and gives convenience to system control.

Based on kenimatic analysis of 3-RTT parallel mechanism, the velocityequation and analytical expression of Jacobin matrix are established. And then space model of this parallel mechanism is derived by adopting space model theoryand then research on its singularity loci is carried out too. By utilizing numerical method, singularity loci curve at different section of Z axis of representative non\|dimensional parallel mechanism in sub-region of space model is obtained. The results provide reference of design of 3-RRT parallel mechanism.

Through analysis on 3-TPT (5DOF) parallel machine, mathematic model of error analysis was established. Based on this, the influence of length errors of legs and position errors of joints were analyzed by Monte-Carlo simulation. The results indicated that the output error of this parallel mechanism was small enough to fulfill accuracy requirements. This research established theory basis for compensation of practical error and optimization of mechanism design parameters, and additionally, provided a method for error estimation of parallel mechanism.

To study the influence of flexible belt on speed fluctuation in mechanical system, on the basis of equivalent mechanism model in rigid mechanical system, a dynamic model about influence on speed fluctuation of flexible belt driveis established. Simulation (Matlab) is adopted to analyze this model and movement simulation curve of flexible mechanical system with changing slippery error rate is obtained. The results indicate that elastic glide of belt has great effect on speed fluctuation of mechanical system.

Reverse modeling is a crucial step of reverse engineering. Development and widely application of laser measuring technology propose higher requirements on reverse modeling technology. In this paper, by taking Imageware and UG as developing platform, utilizing the inner customized development language Scoll of Imageware and UG/OPEN API, combining mid-long distance laser measure equipments, discussion on reverse modeling technology of ship liquid cargo tank is carried out. And then this technology is applied in its reverse modeling, which provides a new method for calculating the capability and rebuilding of ship liquid cargo tank.

Monitoring system has been widely applied in industry and living. An audio and video monitoring system is developed by combining embedded processor and embedded operating system. The hardware of this system is composed of CCD image sensor, GO7007SB video encoder and S3C2410 embedded processor, which samples and compresses data coded in MPEG-4 format. Windows CE5.0 is adopted as operating system to implement the transference and encapsulation of data stream. In thispaper, design of system, hardware, software is presented in details. The practical operating results show that this system is stable and reliable. This framework can decrease the difficulty of developing and shorten the developing period and can be well maintained with high ratio of performance and cost.

Considering the current situation and future development in our country, a video monitoring system based on Java is developed, which implements the remote control on pan/tilt/zoom. This system includes transforming of R2-232 to RS-485, decoder, pan/tilt/zoom and their hardware linking with computer serial communication ports. Pelco-D protocol and comm. jar of java are adopted to implement serial communication. Client controls the pan/tilt and camera at server by socket and this provide solution for control conflicts of pan/tilt/zoom between server and remote clients simultaneously. This system can run at different platforms.

Finite element analysis was carried out to investigate the performance of welded hollow spherical joints with square hollow sections under axial force. Elastic finite element analysis of these joints under axial force adopting finite element model of solid unit was conducted. And then the distribution rule of the stress and displacement of these joints was provided and their mechanical performance was analyzed. By comparing the results with the ones got from experiments, it could be concluded that the two results accorded well.

Practical Halbach array is the approximation of ideal structure, so it can be optimized. The object of this optimization is to generate the strongestmagnetic field with the least magnet. In this paper, aiming at linear Halcach array, the optimization index is proposed and then the optimization result (analytical expression) of this structure is achieved. Experiment is arranged to test this result. This analytical expression has great significance on the engineering application of Halbach array, because for maglev to reduce the weight of magnetic structure while simultaneously increase the intensity of its magnetic field is the key technique.

To realize automatic joining of string-chains consisting of small chain stanzas, concept design of automatic boring hole machine for string-chains is conducted by adopting virtual design and simulation technology. Through concept-experiment-design process, function principle solution of key parts is established and meantime their design process is determined. Furthermore, through skipping innovative design, innovative design to settle conflicts between key partsand concept model to fulfill function requirements of the whole machine are obtained. By discussion of concept design and innovative divergent design, an illustration of developing a machine of this kind based on simulation experiment and virtual prototype technology is proposed.

Four kinds of oils with nano or micro-additives were respectively applied to gear pairs made of 45# steel to investigate the two kinds of particle's influence on the running-in and behavior of the gear pairs. The used two kinds of micro particles are calcium carbonate and quartz whose mean granularities areabout 10 and 100 μm respectively while the two nano ones are diamond and conductor char with about 5 and 30 nm mean granularities respectively. The 3D surfaceroughness of the pinion and wheel before running-in are 32.97 and 24.00 μm. The tribological behaviors of micro particles in the running-in of steel gear pairs showed that abrasive wear is dominant, and the larger granularity, the severer running-in wear. The tribological behaviors of nano particles in running-in of steel gear pairs indicated that they had no effect on wear, but influenced the running-in surface topography and changed its properties by adsorbing, filling and filtering into gear surface. Moreover, it was observed that “negative electric resistances” between the pairs also existed during the two kinds of running-in, and the larger wear ratio difference of the two gears, the more prominent the electric phenomena.